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AP® Physics 1 & 2

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Moderate

Resonance and Energy

APPH12-W1MBGL

A student holds a $256\text{ Hz}$ tuning fork by the handle. The tuning fork is initially silent.

A second student strikes a second $256\text{ Hz}$ tuning fork and allows it to ring near the first tuning fork. The second student then silences their tuning fork, at which point both students notice that the first tuning fork is now ringing (without ever being struck).

The first students claims that this is a violation of the law of conservation of energy because the first tuning fork had no energy to begin with, but ended with sound energy (without any work being done on it).

Which of the following statements is evidence that this situation still conserves energy?

A

Sound is not associated with energy, so the law of conservation of energy does not apply to this situation.

B

The second tuning fork vibrates less (and rings quieter) as the first vibrates more (and begins to ring louder).

C

The second tuning fork feels warm to the touch after completing this experiment.

D

The first tuning fork never begins to ring if the two tuning forks have different frequencies.